linguini1 opened a new pull request, #19181:
URL: https://github.com/apache/nuttx/pull/19181
## Summary
List of patches:
### raspberrypi-4b/bmp280: Include optional registration of BMP280 driver
This commit includes BMP280 driver registration on I2C1 in the RPi4B
bringup logic _if_ the user selects the board-level configuration option
(so as to not interfere with any user's custom implementation of
interfacing with this sensor). A configuration is added with the BMP280
registration, example program and `uorb_listener` that is also
documented.
### raspberrypi-4b/i2c: Added I2C configuration
Includes a new I2C configuration (and documentation for it) to use the
I2C1 bus on the Raspberry Pi 4B.
### rpi4b/bringup: Use correct CONFIG option for I2C char driver
Change the I2C character device registration to depend on the correct
CONFIG option for enabling character drivers.
### bcm2711/i2c: Support I2C_M_NOSTOP/I2C_M_NOSTART properly
This commit adds support for I2C transfers spread across multiple
messages using the I2C_M_NOSTOP/I2C_M_NOSTART. The approach greedily
merges as many sequential I2C messages together as possible and
considers them as a single transfer.
### Related issues
This is part of the GSoC project #18507; milestone 1 item 1 (I2C
improvement).
## Impact
1) BCM2711 I2C driver is improved to support flags required for many I2C
devices, as per the discussion in #16937.
2) An I2C configuration for the most commonly used bus (I2C1) is provided
with
the `i2ctool` for users to play with.
3) A BMP280 configuration is supplied for users to play with a breakout
board if
they wish.
## Testing
I tested using the `raspberrypi-4b:bmp280` configuration supplied in this
patch.
It includes all the functionality of `raspberrypi-4b:i2c1` and tests the I2C
logic patch for supporting NO_STOP/NO_START flags. Here is the output of the
bmp280 program being run on the device:
```console
sh> - Ready to Boot Primary CPU
- Boot from EL2
- Boot from EL1
- Boot to C runtime for OS Initialize
NuttShell (NSH) NuttX-12.13.0
nsh>
nsh>
nsh> ls /dev
/dev:
console
i2c1
null
uorb/
usensor
zero
nsh> bmp280
Absolute pressure [hPa] = 697.700012
Temperature [C] = 27.520000
nsh> bmp280
Absolute pressure [hPa] = 970.929993
Temperature [C] = 26.040001
nsh> bmp280
Absolute pressure [hPa] = 970.969971
Temperature [C] = 26.059999
nsh> bmp280
Absolute pressure [hPa] = 970.989990
Temperature [C] = 26.070000
```
And the I2C scanner:
```console
nsh> i2c dev -b 1 00 77
NOTE: Some devices may not appear with this scan.
You may also try a scan with the -z flag to discover more devices using a
zero-byte wri.
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- 77
nsh>
```
Everything works as expected.
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